373 versus 410

S

Stango21803

Member

Feb 3, 2020

3

1

13

Connecticut

Mar 25, 2020

#1

• Mar 25, 2020

• #1

03 GT with 5spd, CAI, 73mm BBK throttle intake, cat back and lmr’s staggered 17” bullitts. Drive car regularly and frequently on the highway. Looking to get new gears and trying to decide between 373 and 410? Obviously looking to go faster around town but it does spend some time on the highway. Haven’t tuned yet cause I’m waiting until after the gears. Suggestions?

 

Reactions: DarthStang2003

08GT500

5 Year Member

Jul 12, 2018

918

140

63

Massachusetts

Mar 27, 2020

#2

• Mar 27, 2020

• #2

Hi,
You didn’t mention tire aspect ratio. The mechanical advantage you’ll have is worth going to 4.10’s, vs 373’s.
If you’re running 275/45/17” tires & rims with 5th gear’s Ratio being 0.68, at 80 MPH in 5th, running 3.73’s. motor’s RPM’s will be 2550. 2803RPM’s running 4.10’a in 5th, same setup.
Guess it’s how often you’re on the highway, vs lower speeds, continually..
Handy gear/speed Mustang chart from CJPP:

https://www.cjponyparts.com/resources/engine-rpm-calculator

Good luck! Looks like a 3.73 app to me, but that’s your call
-John

 

wmburns

SN Certified Technician

Aug 14, 2009

5,892

514

204

Houston Texas

Mar 27, 2020

#3

• Mar 27, 2020

• #3

Stango21803 said:

Drive car regularly and frequently on the highway.

Click to expand...

It seems to me that the answer is in the base project goals..................

 

DarthStang2003

Member

Jun 30, 2019

38

9

18

South Florida

Mar 28, 2020

#4

• Mar 28, 2020

• #4

I have a very similar setup but with an auto, I plan on putting 3.73s purely because I drive about 40 highway miles a day! I’m saving the 4.10s for my fox body that is not a daily driver.

 

S

Stango21803

Member

Feb 3, 2020

3

1

13

Connecticut

Apr 15, 2020

#5

• Apr 15, 2020

• #5

08GT500 said:

Hi,
You didn’t mention tire aspect ratio. The mechanical advantage you’ll have is worth going to 4.10’s, vs 373’s.
If you’re running 275/45/17” tires & rims with 5th gear’s Ratio being 0.68, at 80 MPH in 5th, running 3.73’s. motor’s RPM’s will be 2550. 2803RPM’s running 4.10’a in 5th, same setup.
Guess it’s how often you’re on the highway, vs lower speeds, continually..
Handy gear/speed Mustang chart from CJPP:

https://www.cjponyparts.com/resources/engine-rpm-calculator

Good luck! Looks like a 3.73 app to me, but that’s your call
-John

Click to expand...

 

S

Stango21803

Member

Feb 3, 2020

3

1

13

Connecticut

Apr 15, 2020

#6

• Apr 15, 2020

• #6

The rear wheels/tires are 17x10.5; 315-35-17

 

Last edited: Apr 15, 2020

ryansgts

New Member

Apr 14, 2020

3

0

1

wisconsin

Apr 15, 2020

#7

• Apr 15, 2020

• #7

I have a similar setup with 4.10 and I’m at 2600 rpm on the highway doing 75 which I don’t think is bad. I’d say go with 4.10, it’s definitely worth it

 

9

96stangfl

Member

Apr 21, 2020

37

1

8

Clearwater FL

Apr 25, 2020

#8

• Apr 25, 2020

• #8

The limit's gotta be about 30 miles a day with the 4.10s, too much of a grind.